There are several ways the world could end, and scientists have given a lot of thought to what the last living thing will be.

The nitrogen cycle is essential to life on Earth, but biological nitrogen must be fixed before it can be used. Scientists aren't sure how the first nitrogen became available... but it might have been volcanoes.

Oxygen is pretty great stuff, but this recently discovered organism couldn’t care less about oxygen. It breathes nitrogen and may offer a window into how the types of cells in OUR bodies may have evolved billions of years ago.

Paul Andersen explains how to formulate questions to guide discussions and investigations. He starts by describing the proper type of questions that should be asked in an AP Biology classroom. He gives four examples of questions that...

Newly described wormlike fossils dating back over half a billion years might be our oldest ancestors, and researchers have mapped and visualized the physical structure of the microscopic communities growing on human tongues!

More than half of Americans take a dietary supplement, but the truth is, most people don't need them. There are, however, a handful of supplements that can be helpful in some situations!

Cha
pters

BEET JUI
CE
...

A lot of ionic compounds dissolve in water, dissociating into individual ions. But when two ions find each other that form an insoluble compound, they suddenly fall out of solution in what's called a precipitation reaction. In this...

Oxygen is pretty great stuff, but this recently discovered organism couldn’t care less about oxygen. It breathes nitrogen and may offer a window into how the types of cells in OUR bodies may have evolved billions of years ago.

Hank introduces us to the brilliant and heartless Fritz Haber, a great mind who is considered "the father chemical warfare," but who also made discoveries and innovations that helped lead to the Green Revolution which is credited with...

Explore the cycling of carbon among carbon reservoirs! Then discover the importance of nitrogen, essential for amino acids and nucleotides, and learn about the nitrogen cycle! Expand details for table of contents. Table of Contents:...

Corn currently accounts for more than one tenth of our global crop production. And over 99% of cultivated corn is the exact same type: Yellow Dent #2. This means that humans grow more Yellow Dent #2 than any other plant on the planet. So...

Chinese alchemists searching for an elixir of eternal life discovered the world's first chemical explosive. Hank has the full story on gunpowder in this SciShow about a big idea of science.

The pee you just flushed without thinking could be a great sample to know what is going on in your body!

Hank describes the desperate need many organisms have for nutrients (specifically nitrogen and phosphorus) and how they go about getting them via the nitrogen and phosphorus cycles.

How do we grow crops quickly enough to feed the Earth's billions? It's called the Haber process, which turns the nitrogen in the air into ammonia, easily converted in soil to the nitrate plants need to survive. Though it has increased...

Explore the unique nuclear bunker housing priceless movie memorabilia, a crucial part of preserving cinematic history for future generations.

Group IV elements, including carbon, silicon, germanium, tin, and lead, have varying reactivity with water, acids, and bases due to their varying electronegativities and bond strengths. Carbon is generally unreactive, while silicon...

A reaction in which a more reactive element replaces a less reactive element in a compound.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

By the end of this learning object, the student will be able to: Explain the meaning of salts and their properties.14004

A polyatomic ion is an ion that is made up of multiple elements. Whenever we have a polyatomic ion present, we are not going to change the name at all. The name of the polyatomic ion will stay just as it is. So when we look at the ionic...

Double replacement chemical reactions, also known as precipitation reactions, are reactions where 2 elements are replaced. But you have to make sure that you replace the correct elements! In this video, we show you not only how to...

Lava brew, clones from seed, personal heat patches, and Hurricane Maria’s landscape legacy.



For mo

re info -

After the hurricane: Maria’s far-reaching effects on Puerto Riforests
tersheds and